长江口工程海上塑料排水板打设工艺及专用船的开发

Development of Technology for Offshore Installation of Plastic Drains and Plastic Drain Driving Barge

中交一航局成功开发了适合长江口工况的安全、优质、高效的海上塑料排水板打设施工工艺,成功开发、改造了多艘适合长江口工况的深水塑料排水板打设船;打设船采用在船舯设打设区的结构,且采用多台成组的打设方式;打设船采用GPS测定船位,排水板排/列间距可得到精确控制;针对塑料排水板打设过程中需要穿透砂被的土工布且穿孔要尽可能小和塑料排水板在软土中的“回带”问题,成功研制了一种特殊的塑料排水板打设板靴;并利用牵引定长排水板入管的引绳作为“回带”的测量工具,解决了排水板“回带”控制工艺技术难题。

CHEC Tianjin Port Construction Corporation has successfully developed a safe and efficient technology for offshore installation of plastic drains which is suitable for the working conditions in the Yangtze Estuary and has also developed and rebuilt a number of deepwater plastic-drain driving barges suitable for the working conditions in the Yangtze Estuary. The drain driving section was located at midship and multiple driving rigs were installed on the barges for plastic drain installation. GPS was employed to position the barges to accurately control the spacing of the plastic drains. Since the plastic drains had to penetrate through the geotextile in the sand blankets with the least aperture in the geotextile and ＂back-drawing＂ of plastic drains may develop during installation of the plastic drains, a special shoe has been successfully developed for the installation of the drains. Ropes of a fixed length passing through the mandrels were used to measure the length of ＂back-drawing＂ , thus solving the technical problem in controlling the ＂back-drawing＂ ofinstalledplasticdrains.